Table 3-1. Operator/Crew
TEST OR INSPECTION
BRAKES DO NOT RELEASE.
Check to see if relay valve is in applied
wait until air pressure on towing vehicle reaches normal operating
open air reservoir draincock,
Check to see if air reservoir draincock
Close air reservoir draincock.
air lines for loose connections.
air lines properly
Check to see if shut-off valves on towing vehicle
Open shut-off valves on towing vehicle.
air lines for restrictions.
or remove any kinks, bends, or restrictions
Check air system for moisture.
Open air reservoir draincock
and drain moisture from system.
BRAKES ARE SLOW TO ENGAGE
Check master cylinder for proper level of brake fluid.
Fill master cylinder with brake fluid to proper level (Chapter 3, Section I).
WHEELS AND TIRES
OR CUPPED TIRES.
Check tires for proper inflation.
inflate tires to proper pressure
Inspect wheels for looseness.
Tighten wheel stud nuts.
Check tires to ensure that they are properly
tire with one that matches.